Foam Rolling
Foam rollers come in different sizes and they also have different densities. I personally have and recommend a full length roller. The one I have is 36" in length and 6" round. I also recommend a medium density roller, anything harder may cause discomfort and potentially wont allow your body to sink into it.
Note: Pain sensitive areas do not like extreme pressure, it just causes more pain and can damage the tissues.
The following is some information that I hope you find helpful.
The idea of the roller is to soften into your tissue restrictions and tender points to allow for release.
When using a foam roller rolling back and forth/up and down on it actually compresses your free nerve endings which pass through your fascial system. This can cause more damage to what is already happening.
You must hold the roller in one place (3-5 minutes) in order for your tissue to soften.
Blasting or forcing anything into your system with motion can create more inflammation and pain. Going slow is for a purpose!
In certain positions with the roller you may be able to use your hand/arm to push it just slightly away from you which gives what you are doing more of a three dimensional affect.
Great creative and experiment...I promise no one is watching you!
Remember to go slow and allow you as a whole person to soften and sink into the roller and wait for your body to respond and open! If you'd like to learn more about foam rolling and/or check out one of my self-treatment myofascial release classes.